mirror of
https://gitlab.kitware.com/vtk/vtk-m
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86 lines
2.5 KiB
C
86 lines
2.5 KiB
C
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//=============================================================================
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//
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// Copyright (c) Kitware, Inc.
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// All rights reserved.
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// See LICENSE.txt for details.
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//
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// This software is distributed WITHOUT ANY WARRANTY; without even
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// the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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// PURPOSE. See the above copyright notice for more information.
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//
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// Copyright 2015 Sandia Corporation.
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// Copyright 2015 UT-Battelle, LLC.
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// Copyright 2015. Los Alamos National Security
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//
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// Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
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// the U.S. Government retains certain rights in this software.
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// Under the terms of Contract DE-AC52-06NA25396 with Los Alamos National
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// Laboratory (LANL), the U.S. Government retains certain rights in
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// this software.
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//
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//=============================================================================
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#ifndef vtk_m_cont_ArrayHandleConstant_h
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#define vtk_m_cont_ArrayHandleConstant_h
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#include <vtkm/cont/ArrayHandleImplicit.h>
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namespace vtkm {
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namespace cont {
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namespace detail {
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template<typename ValueType>
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struct ConstantFunctor
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{
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VTKM_EXEC_CONT_EXPORT
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ConstantFunctor(const ValueType &value = ValueType()) : Value(value) { }
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VTKM_EXEC_CONT_EXPORT
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ValueType operator()(vtkm::Id vtkmNotUsed(index)) const
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{
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return this->Value;
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}
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private:
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ValueType Value;
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};
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} // namespace detail
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/// \brief An array handle with a constant value.
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///
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/// ArrayHandleConstant is an implicit array handle with a constant value. A
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/// constant array handle is constructed by giving a value and an array length.
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/// The resulting array is of the given size with each entry the same value
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/// given in the constructor. The array is defined implicitly, so there it
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/// takes (almost) no memory.
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///
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template<typename T>
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class ArrayHandleConstant
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: public vtkm::cont::ArrayHandleImplicit<T, detail::ConstantFunctor<T> >
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{
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typedef vtkm::cont::ArrayHandleImplicit<T, detail::ConstantFunctor<T> >
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Superclass;
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public:
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VTKM_CONT_EXPORT
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ArrayHandleConstant(T value = T(), vtkm::Id numberOfValues = 0)
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: Superclass(detail::ConstantFunctor<T>(value), numberOfValues) { }
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};
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/// make_ArrayHandleImplicit is convenience function to generate an
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/// ArrayHandleImplicit. It takes a functor and the virtual length of the
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/// arry.
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///
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template<typename T>
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vtkm::cont::ArrayHandleConstant<T>
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make_ArrayHandleConstant(T value, vtkm::Id numberOfValues)
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{
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return vtkm::cont::ArrayHandleConstant<T>(value, numberOfValues);
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}
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}
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} // vtkm::cont
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#endif //vtk_m_cont_ArrayHandleConstant_h
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